These are now available from Studio Siberia. http://siberia-miniatures.ru/ the box art is awesome.
Typically I prime horses white, add a layer of acrylic paint paler than the desired colour then when its dry paint a darker oil colour over the top and wipe off with a cloth so the darker oil catches in all the folds and creases. I use Halfords white car primer which gives a nice even coat.
On this occasion I tried using a buff colour to avoid the extra coat of acrylic colour, it was a bit shiny and thick to start with but the end result turned out pretty good to be honest.
The end result on the horses looks something like the below before I add any detail and colour the mains, tails and hocks. It may sound drawn out but its much quicker than painting them by hand and has the advantage thats its more technique than skill.
I decided the first ten would be Ossetians, these were a fairly numerous Christian ethnic grouping in the Caucasus mountains and fought through the Great War and the Civil War forming part of the Volunteer Army at one point and also part of the Shukiro's Wolves Divizion too.
I was asked for close ups so have added a few, again the officer on the grey is a favourite, these two dont comein the pack but are available seperately.